Electric lamp



April 23 1946.

G. c. mm 2,398,969

' ELECTRIC LAMP Fi1e i Jan. 29, 1945 JNVENTOR.

G r'orer 62' finger BY 7 Maxi/Maw Patented A r. 23, 1946 2,398,969 ELECTRIC LAMP Grover 0. Singer, Brownsville, Tex.

Application January 29, 1945, Serial No. 575,087

4 Claims. (01.176-34) This invention relates to electric lamps. An object of the invention is the provision of an electric lamp in which the bulb and base are the.base having a wide passage adapted to be formed integrally of transparent materials, with closed by a plug of transparent materials with the inner end of the plug curved to form a re-. flecting surface, supports for lead-in wires being imbedded in the base and projecting into the bulb with the inner projecting ends of the supports providing connections for the usual'fllaments.

Another object of the invention is the provision of an electric lamp having a bulb and base member formed integrally of transparent materials, the base member having a wide passage through which are adapted to be inserted the fila- -ments and filament supports which are attached to metal tubes embedded in the base member, said passage being closed by a transparent'plug having an axial passage through which air is exhausted, said passage being closed in the usual manner.

A further object-of the invention is the provision of an electric lamp having a bulb and base member formed integrally of transparent materials, said base member having a wide passage through which are adapted to be inserted filaments and their supports which are connected to metal tubes projecting into the bulb and embedded in the base, said tubes being applied to the base when the lamp is molded, the inner ends of said tubes being initially closed with pipes being inserted in the metal tubes for suppling a embedded in the base member. and pipes for cooling the tubes when the bulb and base member are molded.

Fig. 2 shows a vertical section of a lamp in the I second stage of completion with the filaments and reflecting materials in position within thebulb.

Fig. 3 is a vertical section showing a complete.

I bulb ready for use.

Fig. 4 is a horizontal section taken along the line 4-4 of Fig. 2.

Fig. 5 is an enlarged iragmentary side view of a filament and its support.

Fig. 6 is an enlarged vertical section of a metal' tube which is embedded in the molten glass when the lamp is cast, and showing a pipe for supplying cooling fluid to the tube.

Fig. 7 is an enlarged vertical section of a tube with the supports and filaments in position in the tube. v

Referring more particularly to the drawing, 10

designates a bulb which is formed of transparent material, while ll indicatesa base formed integrally with ,the bulb Ill. The outer end of the bulb may have any configuration suitabl for the cooling fluid during the molding operation to prevent the heat from melting the inner ends of the ;tubes, the closed ends of .the tubes when sufliciently cool, being shearedofl' to receive supports and filaments, the said tubes receiving lead-in wires which are soldered to the outer ends of the tubes with the solder forming a seal to close the .said outer ends, the wide passage being closed by a plug which is sealed to the walls of the passage,

the inner end of the plug which is formed of transparent materials being polished or provided with a reflecting surface which cooperates with uniformly arranged triangularly shaped sections of reflecting material on the inner face of the bulb for directing the light along a predetermined path. r This invention will be best understood from a consideration of the following detailed description, in view of-the accompanying drawing forming a part of the specification; nevertheless, it is to be understood that the inven ion is not confined to the disclosure, being susceptible of such changes and modifications as define no material departure from the salient features of the invention as expressed in the appended claims.

Inthe drawing: Fig. its a vertical section of a bulb and integrally formed base member with metal tubes purpose, but in this case said outer or closed end I2 is providedwith corrugations I3 at its inner face for the purpose of diflusing the light rays to eliminate the usual glare of a head lamp. The base i I is provided with a relatively wide'passage I4 for a purpose which will be presently explained.

Metal tubes l5 are-embedded in the base member and have their inner ends closed as shown I at l6, and these inner ends project into thebulb Ill. The outer ends I I of said tubes are open and project beyond the outer end I 8 of the base member.

These tubes are incorporated in the base ll when the bulb and base member are cast from the molten glass. However, due to the intense heat of the molten glass the metal tubes would melt.

is forced into the interior or the tubes. Such fluid may bean inert gas, such as nltrogenor carbon dioxide. However, the temperature of the cooling fluid must be such that the materials ot'the base l I will not be chilled.

After the lamp has been completed to the stage shown in Fig. 1 and has been cooled 'sutliciently the inner closed ends lloi the tubes ii are punc-. tured or drilledso that both ends of the tubes will be open. The next step in the manufacture ered by beeswax as indicated at 2| adjacent the 7 tubes i5.

After the reflecting materials have been applied as described to the inner surface of the bulb ID a suitable solvent is poured into the bulb through the passage [4 and the beeswax or other materials are removed, leaving a pattern of reflecting materials as illustrated in Fig. 4. v

As previously explainedthe passage 14 is relatively wide so that an instrument may be inserted through the, passage M for applyin the beeswax, for injecting the reflecting materials. and for injecting the solvent to remove the beeswax after the reflecting materials have been fixed in posi-' tion.

The method of applylngthe reflecting materials and the beeswax, molasses or other masking materials is described in my Patent No. 2,365,224 granted Dec. 19, 1944.

Referring more particularly to Has. 6 and 7 it will be seen that filaments II are mounted within the bulb ill in a particular manner, and the tubes l5 are employed as an element of the support. As has been previously stated the closed inner end It of each tube has been removed and a second tube 28 is inserted through the passage l4 and forced into the open ended tube [5 from the interior of the bulb III. This tube is provided with diametrically disposed clamping members 21 and 28. These clamps are formed by splitting the ends of the lateral protections as shown at 29. The straight end III of the filament is then inserted within the split and the split ends are then clamped down on the filament by a suitable tool which has been inserted through the possage M.

A lead-in wire is inserted through the outer open end of each tube II and this wire is extended downwardly into the auxiliary tube 26 so aaeaoes the passage ti. The inner end of the plug as shown at is curved to form a reflector and reflecting materials may be either applied to the inner end of the plug or it may be highly polished. Furthermore the plug may be formed of different colored glass if desired.

As shown more particularly in Fig. 3 the com- 1 pleted lamp is illustrated with the filaments andplug 40 in position. The filaments are supported by the tubes 26 applied to the tubes l 5.

While the filaments are shown as concentrated within the confines of the base member I I, it will be appreciated that the auxiliary tubes 25 may be bent at an angle outwardly from the center so that the filaments may be spread outwardly and in agreater circumference within the bulb for increasing the illumination of the lamp.

I claim:

1. An electric lamp comprising a base, a bulb formed integrally with the base, said base having anaxial passage leading from the interior of the bulb to the outside, a glass plug neatly fitting said passage and sealed to the walls thereof, the inner end of the plug having a curved surface which forms a reflector inwardly of the inner end of the base, the inner wall of the bulb being provided with reflecting material, a filament in the bulb, metal tubes extending through the base and supporting the filament.

2. An electric lamp comprising a base, a bulb formed integrally with the base, said base having an axial passage leading from the interior of the bulb to the outside, a glass plug neatly fitting said passage and'sealed to the walls thereof. the inner end of the plug having a curved surface which forms a reflector inwardly of the inner end of the base, the inner wall of the bulb being provided with reflecting material, a filament in that the tubes 28, i5 and the wire 36 are in con-.

ductive relationship. The lead-in wire may extend to the top of the tube 28 or it may terminate short of the top. v

The outer end oieach wire 35 as shown at 36 is soldered to the outer end of the tube It and sufficient solder is applied to seal the outer ends of said tubes. I

One of the tubes 26 and likewise the lead-in wire 35 may form the positive electrode while a diametrically disposed tube 25:! (Fig. 4) may form the negative electrode. On the other hand, two of the tubes l5 may form the positive so that the outer ends 36-0! said tubes will engage the usual contact in a socket while the other two tubes will be in contact with a metal sleeve?! which is mounted on the threaded base member II.

A plug 40 which is formed of glass is adapted to close the passage II and it is sealed in place in the usual manner. This plug is provided with an axial passage ll through which the air is exhausted from the bulb l0 after which it is sealed at 42 in any suitable manner. In other words, the glass may be fused to close the outer end of the bulb, metal tubes extending through the base and having one end projecting into the bulb, the other end of said tube terminating at the outer end of the base, a lead-in wire extending through each tube, one end of each wire having connections with a filament, the outer end of each tube being closed and having secured therein the filament wire ends.

3. An electric lamp comprising a base, a bulb formed integrally with the base, said base having an axial passage leading from the interior of the bulb to the outside, a glass plug neatly fit ting said passage and sealed to the walls thereof, the inner end of the plug having a. curved surface which forms a reflector inwardly of the inner end of the base, the inner wall of the bulb being provided with reflecting material, a filament in the bulb,- metal tubes extending through the base into the bulb, metal supports mounted in the inner ends of-the tube and provided with oppositely disposed lateral clamps, each clamp receiving the 'end of a filament, lead-in wires received by the tubes and solder sealing the outer ends of the tubes and the wires to said tubes.

4. In an electric lamp having a base and an integrally formed bulb composed of transparent materials, the inner surface of the bulb being provided with trlangularly shaped sections of reflecting materials extending from the base to points adjacent the top surface, said base having an axial passage, a plug closing said passage, the

inner end of the plug projecting into the bulb and provided with a reflector, a series of filaments arranged around the inner end of said plug and conductive means embedded in the base and supporting the filaments.

GROVER C. SINGER. 

